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CTLA-4 blockade by a human MAb enhances the capacity of AML-derived DC to induce T-cell responses against AML cells in an autologous culture system.

Abstract：

BACKGROUND:Cells from AML patients can differentiate into the phenotype of DC when cultured with GM-CSF and IL-4. Such cytokine-treated AML-derived DC (AML-DC) can stimulate autologous T cells. In this study we examined whether an anti-CTLA-4 MAb (MDX-010) could enhance the generation of autologous anti-AML T cells. METHODS:MAb MDX-010 was added to AML PBMC cultures in the presence of GM-CSF and IL-4, a previously reported AML-DC culture method of generating anti-AML T cells. T-cell activation and proliferation were examined thereafter. RESULTS:Addition of MDX-010 to GM-CSF/IL-4-conditioned AML-DC cultures induced a mean seven-fold increase in the numbers of autologous T cells compared with cultures without MDX-010 (P < 0.007). T cells stimulated by AML-DC with CTLA-4 blockade were significantly more cytotoxic towards autologous AML cells than those without MDX-010 (42 +/- 23% vs. 26 +/- 15%, E:T ratio of 20). T cells stimulated by AML-DC with CTLA-4 blockade had significantly greater proportions of T cells producing IFN-gamma in response to autologous AML cells than those cultured with AML-DC alone (10.7 +/- 4.7% vs. 4.5 +/- 2.4% for CD4+ IFN-gamma+ CD69+ and 9.8 +/- 4.1% vs. 4 +/- 2.1% for CD8+ IFN-gamma+ CD69+ with or without MDX-010; n = 7; P < 0.007, P < 0.003, respectively). DISCUSSION:CTLA-4 blockade enhances the activity and numbers of AML-reactive T cells that can be stimulated by autologous AML-DC and may enhance the efficacy of adoptive immunotherapy of AML.

journal_name

Cytotherapy

journal_title

Cytotherapy

authors

Zhong RK,Loken M,Lane TA,Ball ED

doi

10.1080/14653240500499507

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

3-12

issue

1

eissn

1465-3249

issn

1477-2566

pii

N0M3522V56183065

journal_volume

8

pub_type

杂志文章

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